.board-row{
  display: flex;
  justify-content: center;
  align-items: center;
}

.square{
  width: 45px;
  height: 45px;
  line-height: 45px;
  text-align: center;
  font-size: 20px;
  background-color: #fff;
  border: solid 1px #999;
  margin-bottom: -1px;
  margin-right: -1px;
}